Attachment for pump-pistons.



PATENTED APR. 24, 1906.

J. MOEWEN. ATTACHMENT FOR PUMP PISTONS.

APPLICATION FILED APR. 27. 1905.

Jkrzflloizy azz -Atforneys UNITED STATES JOHN MoEI/VEN, OF BRADFORD, PENNSYLVANIA.

ATTACHMENT FOR PUM P-PISTONS.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed April 27, 1905. Serial No. 257,772.

To all whom it may concern:

Be it known that 1, JOHN MoEwEN, a citizen of the United States, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented a new and useful Attachment for PumpPistons, of which the following is a specification.

This invention relates to certain improvements in pum s, and more particularly toan improved pac ting ring or cup especially designed for use in connection with pump-pistons for oil-wells.

In pumps of this type experience has demonstrated that when the ordinary leather, canvas, or rubber packing-rings are employed the action of the sand, grit, and other foreign matter usually elevated with the oil has a tendency to cut or otherwise injure the cups, so as to render them practically unfit for use after a short period of service; and the primary object of my invention is to provide means for protecting said cups whereby their period of usefulness may be materially prolonged and the elliciency of the pump proportionally increased.

The invention consists in surrounding the packing rings or cups with a metal protecting strip or band, preferably in the form of a split ring, the adjacent ends of which are spaced a short distance apart to thereby permit the expansion and contraction of said cups, and thus insure the necessary frictional contact with the pump-barrel, while at the same time effectually preventing undue wear and cutting of the packing-cup by the action of the sand and grit.

The invention further consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in form, proportions, and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

In the accompanying drawings, forming a part of this invention, Figure 1 is a longitudinal sectional view of a portion of an oilpump, showing a plurality of packing-cups constructed in accordance with my invention applied thereto. Fig. 2 is a perspective View of one of the cups detached. Fig. 3 is a similar view showing a modified form of the inve ntion.

Similar numerals of reference indicate cor responding parts in all the figures of the drawings.

Referring to the drawings, 5 designates the pumpbarrel or tubular lining of an oil-well, in which is mounted for reciprocation the hollow piston 6, said elements being of the usual construction and forming no part of the present invention. Mounted on the piston 6 and retained in position by the usual clamping-collars 7 are my improved packing rings or cups 8, the latter being preferably formed of leather, although canvas, rubber, or other flexible material may be employed in the construction of said cups, if desired. Surrounding the vertical walls 9 of the cups and disposed flush with the upper edges of the latter are metal protecting-bands 10, preferably in the form of split rings, the adjacent ends of which are spaced apart, as indicated at 11, so as to permit free expansion and contraction of the cups, and thereby insure frictional engagement of said cups with the interior walls of the barrel 5.

The metal bands 10 are preferably secured to the cups by means of rivets 12, while the adjacent ends of the band are inclined or beveled, as shown at 13, so as to present a smooth and practically continuous metallic surface to the pumpbarrcl, and thereby pre vent sand, grit, and other granular material usually elevated with the oil when pumping the latter from cutting or otherwise injuring the leather or other flexible material forming the body of the cup. The protecting-bands preferably terminate a short distance above the bottom of the inwardly-extending flanges 14 of the cups, whereby any expansion of the leather when clamping said cups in position or the piston will not affect the metal bands.

In Fig. 3 of the drawings there is illustratcd a modified form of the invention in which the metal band is formed in two sections 15 and 16, the adjacent ends of which are also spaced apart, as shown at 17, to permit the necessary expansion of the packingcups.

From the foregoing description it will be seen that there is provided an extremely simple and inexpensive device admirably adapted for the attainment of the ends in view.

Having thus described the invention, what is claimed is 1. A packin -cup for pump-pistons comprising a flexib e body portion provided with an inwardly-extending flange for engagement with the pump-piston, and a split ring secured to and surrounding the exterior walls of the body portion, the adjacent ends ofthe ring being spaced apart to expose a portion of the flexible body portion and inclined or beveled in opposite directions.

2. A packing-cup for pumppistons comprising a flexible body portion provided with an inwardly-extending flange for engage ment with the pump-piston, and a split metal ring secured to and surrounding the exterior walls of the body portion with its adjacent ends spaced apart and inclined or beveled in opposite directions, the upper edge of the ring being disposed flush with the top of the body portion and its lower edge terminating short of the bottom of the inwardly-extending flange.

In testimony that I claim the foregoing as my own I have hereto affixed my signature 111 20 the presence of two witnesses.

JOHN MoEWEN.

WVitnesses:

JAMES GEORGE, W. E. MoEwEN. 

